Doped, low-temperature co-fired glass-ceramic (LTCC) insulating substrates, and related wiring boards and methods of manufacture

Abstract

Doped, low-temperature co-fired ceramic (LTCC) insulating substrates and related wiring boards and methods of manufacture are disclosed. The doped, LTCC insulating substrate is formed from a baked (e.g., sintered) glass-ceramic aggregate material formed from a glass material, a ceramic filler material, and a composite oxide. The crystallized glass-ceramic aggregate is then doped with Iron and/or Manganese before baking. Iron or Manganese can further reduce dielectric loss and the loss tangent of the LTCC insulating substrate formed from that glass material. The glass material becomes crystallized due to an oxide crystal phase being deposited on the glass material during baking, which reduces the dielectric losses. This may be important for the application use as wiring boards for high radio-frequency (RF) electrical circuits where low dielectric loss and loss tangent is desired to achieve a desired signal transmission delay performance.

What is claimed is: 
     
       1. A doped, glass-ceramic substrate, comprising:
 a crystallized glass-ceramic aggregate, comprising:
 a crystalized glass on which an oxide crystal phase is deposited; 
 a ceramic filler material; and 
 a composite oxide; and 
 
 a doping material doped at a doping concentration level between 200 parts per million (ppm) and 600 ppm in the crystallized glass-ceramic aggregate, the doping material comprising Iron Oxide (FexO y ), 
 wherein the crystallized glass comprises a 5-30% weight of MgO, a 10-30% weight of CaO, a 40-65% weight of SiO 2 , and a 1-7% weight of Aluminum Oxide Al 2 O 3  and wherein a combined weight of the MgO, CaO, SiO, and Al 2 O 3  does not exceed 100% of the weight of the crystallized glass. 
 
     
     
       2. The doped, glass-ceramic substrate of  claim 1 , wherein the oxide crystal phase comprises a diopside oxide crystal phase. 
     
     
       3. The doped, glass-ceramic substrate of  claim 1 , wherein the composite oxide comprises Aluminum (Al) and Cobalt (Co). 
     
     
       4. The doped, glass-ceramic substrate of  claim 1 , wherein the composite oxide comprises Titanium (Ti). 
     
     
       5. The doped, glass-ceramic substrate of  claim 1 , wherein the ceramic filler comprises Al 2 O 3 . 
     
     
       6. An electrical wiring board, comprising:
 at least one insulating layer; and 
 at least one wiring conductor integrated into the at least one insulating layer, the at least one insulating layer comprising:
 a crystallized glass-ceramic aggregate, comprising:
 a crystalized glass on which an oxide crystal phase is deposited; 
 a ceramic filler material; and 
 a composite oxide; and 
 
 
 a doping material doped at a doping concentration level between 200 parts per million (ppm) and 600 ppm in the crystallized glass-ceramic aggregate, the doping material comprising Iron Oxide (Fe x O y  
 wherein the crystallized glass comprises a 5-30% weight of MgO, a 10-30% weight of CaO, a 40-65% weight of SiO 2 , and a 1-7% weight of Al 2 O 3 , and wherein a combined weight of the MgO, CaO, SiO 2 , and Al 2 O 3  does not exceed 100% of the weight of the crystallized glass. 
 
 
     
     
       7. The electrical wiring board of  claim 6 , wherein the oxide crystal phase comprises a diopside oxide crystal phase. 
     
     
       8. The electrical wiring board of  claim 6  further comprising at least one integrated circuit (IC). 
     
     
       9. The electrical wiring board of  claim 6  integrated into a device selected from the group consisting of: a set top box; an entertainment unit; a navigation device; a communications device; a fixed location data unit; a mobile location data unit; a global positioning system (GPS) device; a mobile phone; a cellular phone; a smart phone; a session initiation protocol (SIP) phone; a tablet; a phablet; a server; a computer; a portable computer; a mobile computing device; a wearable computing device; a desktop computer; a personal digital assistant (PDA); a monitor; a computer monitor; a television; a tuner; a radio; a satellite radio; a music player; a digital music player; a portable music player; a digital video player; a video player; a digital video disc (DVD) player; a portable digital video player; an automobile; a vehicle component; avionics systems; a drone; and a multicopter.